A) \[4{{s}^{o}}3{{d}^{4}}\]
B) \[4{{s}^{2}}3{{d}^{2}}\]
C) \[4{{s}^{2}}3{{d}^{0}}\]
D) \[3{{p}^{6}}4{{s}^{2}}\]
Correct Answer: A
Solution :
Electronic configuration of chromium \[Cr\to [Ar]\,3{{d}^{5}}4{{s}^{1}}\] \[C{{r}^{2+}}\to [Ar]3{{d}^{4}}4{{s}^{0}}\].
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